(CH3)2CHCH2OH__H2SO4__ = A __HBR__= B___NaOH = C

CH3-CH-CH2OH (H2SO4,t)= CH3-C=CH2 + H2O             |                                                   |          CH3                                             CH3 CH3-C(CH3)=CH2+ HBr=CH3-C(CH3)-CH3                                                            |                                                           Br CH3-C(CH3)-CH3 + NaOH=CH3-C(CH3)-CH3  +NaBr           |                                                   |          Br                                                OH .......................................................................................................................................................................... .........................................................................................................................................................................